Chuck.



PATENTED 001". so, 1906. 4

G. ROTHENBU'GHER.

CHUCK.

APPLICATION TILED SEPT. 28. 1905.

. longitudinal movement of sleeve 6.

'1 UNITED STATES PATENT OFFICE.

cEoReE ROYTHENBUCHER, or NEW YORK, N. Y.

CHUCK.

, sesa e. I

j Specification of Letters Patent,

Application filed September 28. 1906. Serial'No. 280.405.

Patented Oct. 30, 1906.

To all whom, it may concern.-

Be it known-that I, GEORGE ROTHEN- 'BiioHER, a citizen of the United States, resid constructed that itmay' be'readily manipw.

lated and that -it is adapted to securely grasp tools down to the smallest diameter.

In the accompanying drawings, Figure 1 is a longitudinal section of my improved chuck;

Fig. 2, a cross-section on line 2 2, Fig.1; Fig.

3, .a cross-section on line 3 3, Fig. 1; Fig. 4, a cross-section on line 4 4, Fig. 1, showing the parts in a different position; Fig. 5, a front view of the sleeve; Fig. 6, Ya longitudinal section on line 6 6, Fig. 5 Fig. 7, a cr0ss-sec tion on line 7 7, Fig. 6, Fig. 8, a detail of one of the cam-actuating springs; Fig. 9, a perspective view of one of thecams; Fig. 10, a front view thereof.' Figs. 11 to 13 are details of the three coacting chuck-jaws; Fig. 14, a cross-section through the aws, showing them in their extreme inner position; and Fig. 15, a detail of-part of the bushing.

The letter 4; indicates the socket or holder of the chuck, adapted to receive the spindle, (not shown,) by means of which it is rotated in the usual manner. The socket a is surrounded by a tubular sleeve or body b and imparts motion to the same by intermeshing teeth a b of the parts a b, respectively. A

coileds ring 0, bearing withone end against a ring 2 ofsleeve b and with its other end against, a flange a of socket a, normally holds the teeth a b in engagement. The sleeve 5 is axially movable on socket a and may be drawn-forward b means of the shell hereinafter describedto isengage teeth b a.

Thus the chuck ma be arrested to fit atool formed.

\.- The sleeve into the same, whi e the socket acontinue's to rotate. Stops a on socket d limit the From sleeve 6 project forwardly a suitable numberof longitudinal ribs bfl'Figs'. 5 and 6, between which longitudinal slots adapted for the reception of the chuck j aws, are

bis surroundel by a tubular shell d, carrying the perforated cap d. shell this rotatable on sleeve 1) and longitudinally rnovable therewith, a bushing e, se-

The

cured to shell 01 by screws eybeing interposed between the arts (1 and b. A spiralspring f, seatedwit in a circumferential groove of sleeve 1) and secured at its ends to the parts e and d, serves to turn shell d, and thereby close the jaws in manner hereinafter described. This rotation of shell (1 is'limited by a pair of pins 1) of sleeve I), that engage slots 6 of bushing e. I

To the inner side of shell 01 are hinged at g a series of arched cams or push-pieces g, surrounding ribs b The cams g are adapted to be pressed outward by a pair of springs h,

seated within inner circumferential grooves g of the cams. c

The inner concave surfaces of the cams operatively engage the jaws 7c of the chuck, which are located within the longitudinal slots formed between the ribsb, Figs. 3 and 4. The jaws are made in the form of cylinders, which are by the cams g ferqcd inwardly against the tool. I refer to provide the jaws with annular circumferential ribs, 'Which are adapted to overlap and tothus grasp tools of the smallest possible diameter. As shown, the jaw 71 has ribs 1/, arranged in spaced pairs, while the jaw j has ble diameter may be grasped by such ribs.

Each cam g projects from its fulcrum g graduall inward, so thatby the partial rotation o shell (1 in one direction the chuckjaws are crowded inward by such cams. Means are provided for altering this dip of the cams and thereby gaging the chuck for tools of larger or smaller diameters; These means consist of-a rotatable ring I, embracing 'sleev'e d and held in place b cap (1'. The ring 1 is provided at its inner si e with a air of stepped grooves l, the steps Z Z of such grooves merging into 'one another. The steps Z Z l engage fingers g projecting outwardl from the free ends of cams g and assing t ough openings d of shell (1'. Thus by alining the proper steps with fingers g the dip of the cams may be adjusted, as will be readily understood. The last or deepest similarly-arranged ribs which are stagstep Z merges into a 'pocket'l which ering the assemblage of the parts. The lay of the ring Z is determined by a pin on shell d, which engages a groove 1 of the ring.

By grasping shell (1 and drawing'it forward cams 9 will be turned relatively to the chuck-jaws, so as to cause the latter to diverge, Fig. 4', while the chuck is simultaneously uncoupled from the spindle. The

tool being'inserted, shell d is released, when spring fwill return the shell to its normal position, and thereby cause cams g to force the chuck-jaws inward, Fig. 3, and against the tool.- At the same time. the teeth a b will become rengaged by spring 0 to recouple the chu ck with the spindle.

If desired, the socket a may be omitte and the chuck be mounted directly upon the spindle.

What I claim is 1. A chuck provided with a shell, inclosed cams, jaws actuated by the cams, and means for adjusting the dip of the cams, substantially as specified.

2. A chuck provided with a shell, inclosed cams, jaws actuated by the cams, and a relatively movable stepped ring adapted to engage the cams, substantially as specified.

3. A chuck rovided with a perforated shell, spring-in uenced cams hingedthereto,

fingers'projecting from the cams through the shell perforation, jaws actuated by the cams, and a relatively movable stepped ring adapted to engage the cam-fingers, substantially as specified.

4. A chuck provided with a first cylindrical jaw having annular ribs arranged in spaced pairs, a second cylindrical jaw havmg similarly-arranged annular ribs, and a third cylindrical j aw having equidistant annular ribs that project between the rib )airs of the first and second jaws, substantially as specified.

GEORGE ROTHENBUCHER. Witnesses:

ERIC LUUR, FRANK v. BRIESEN. 

